C$UNSET
The C$UNSET library routine removes a variable from the environment.
It can be used to remove any configuration setting except for keystrokes. Keystrokes cannot be initialized to their defaults by calling C$UNSET, they must be reset using a Format 6 SET statement, setting them to the proper value as described in Default Keyboard Configuration.
Syntax:
 CALL "C$UNSET" USING envVarName
Parameters:
envVarName
PIC X(n)
Specifies the environment variable to be removed.
Examples:
Example - Remove custom property my.report.path
call "c$unset" using "my.report.path"